Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hHR21BC0503819606KIAA0078    HR21    NXP1    SCC1    HRAD21    MCD1    RAD21   
hHR21NM_0062659606HR21    MCD1    NXP1    SCC1    HRAD21    KIAA0078    RAD21   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002